Lava is generaly found deep underground. Lava can spread, so destroying blocks in its path will allow Lava to "Grow". Lava can be transported by Buckets and placed in a different location. If a Lava source touches Water, it will turn into Obsidian. If the Lava isn't a source it will turn into Cobblestone. Lava can set objects near it on Fire when it throws bits of Lava into the air (The player can not be set on fire by what the Lava throws into the air). Unplaced objects that touch Lava are destroyed on contact making it a great place to dispose of unwanted items. Flamable objects (Including the player) which come into direct contact with Lava will be set on Fire.